GE 845 Instruction Manual page 358

MONITORING
4–254
Aging Factor
The Aging Factor element detects the aging of the transformer in per unit normal
insulation aging. The element can be set for an alarm or trip, whenever the actual aging
factor (as computed by the relay) is bigger than the (defined as acceptable) setting of the
aging factor PKP for the specified time delay.
Path:
Setpoints > Monitoring > Transformer > Aging Factor
FUNCTION
Range: Disabled, Alarm, Latched Alarm, Configurable
Default: Disabled
PICKUP
Range: 1.1 to 10.0 in steps of 0.1
Default: 2.0
Enter a setting for the aging factor, above which the element will operate. The setting
must be above the maximum permissible aging factor under emergency loading
conditions, and maximum ambient temperature.
PICKUP DELAY
Range: 0 to 60000 min in steps of 1 min
Default: 1 min
This setting is used to select a pickup time delay that is used to delay the operation of
the protection.
OUTPUT RELAY 1 (X)
Range: Do Not Operate, Operate
Default: Do Not Operate
The menu includes a list of available output relays to be set for operation or no operation
upon protection operation.
BLOCK
Range: Off, Any operand from the list of FlexLogic operands
Default: Off
The Neutral IOC is blocked when the selected operand is asserted.
EVENTS
Range: Enabled, Disabled
Default: Enabled
The selection of the
Enabled
setting enables the Events function.
845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 4: SETPOINTS